diff options
Diffstat (limited to 'arch/s390/kernel/head.S')
| -rw-r--r-- | arch/s390/kernel/head.S | 41 |
1 files changed, 34 insertions, 7 deletions
diff --git a/arch/s390/kernel/head.S b/arch/s390/kernel/head.S index b804c55bd91..2710e66fefb 100644 --- a/arch/s390/kernel/head.S +++ b/arch/s390/kernel/head.S @@ -345,10 +345,32 @@ iplstart: bno .Lnoreset la %r2,.Lreset lhi %r3,26 - .long 0x83230008 + diag %r2,%r3,8 + la %r5,.Lirb + stsch 0(%r5) # check if irq is pending + tm 30(%r5),0x0f # by verifying if any of the + bnz .Lwaitforirq # activity or status control + tm 31(%r5),0xff # bits is set in the schib + bz .Lnoreset +.Lwaitforirq: + mvc 0x78(8),.Lrdrnewpsw # set up IO interrupt psw +.Lwaitrdrirq: + lpsw .Lrdrwaitpsw +.Lrdrint: + c %r1,0xb8 # compare subchannel number + bne .Lwaitrdrirq + la %r5,.Lirb + tsch 0(%r5) .Lnoreset: + b .Lnoload + + .align 8 +.Lrdrnewpsw: + .long 0x00080000,0x80000000+.Lrdrint +.Lrdrwaitpsw: + .long 0x020a0000,0x80000000+.Lrdrint #endif - + # # everything loaded, go for it # @@ -517,11 +539,16 @@ startup:basr %r13,0 # get base l %r2, .Lrcp2-.LPG1(%r13) # try with Read SCP b .Lservicecall-.LPG1(%r13) .Lprocsccb: - lh %r1,.Lscpincr1-PARMAREA(%r4) # use this one if != 0 - chi %r1,0x00 - jne .Lscnd - l %r1,.Lscpincr2-PARMAREA(%r4) # otherwise use this one + lhi %r1,0 + icm %r1,3,.Lscpincr1-PARMAREA(%r4) # use this one if != 0 + jnz .Lscnd + lhi %r1,0x800 # otherwise report 2GB .Lscnd: + lhi %r3,0x800 # limit reported memory size to 2GB + cr %r1,%r3 + jl .Lno2gb + lr %r1,%r3 +.Lno2gb: xr %r3,%r3 # same logic ic %r3,.Lscpa1-PARMAREA(%r4) chi %r3,0x00 @@ -750,7 +777,7 @@ _stext: basr %r13,0 # get base # check control registers stctl %c0,%c15,0(%r15) - oi 2(%r15),0x20 # enable sigp external interrupts + oi 2(%r15),0x40 # enable sigp emergency signal oi 0(%r15),0x10 # switch on low address protection lctl %c0,%c15,0(%r15) |